WCF namedpipe callback timeout exception

I am using WCF for sending and getting data to and from 2 different win form applications running in the same machine. 开发者_如何学CI am using namedpipe and duplexchannel. My client side implementation is shown below.

InstanceContext myContext = new InstanceContext(this);

NetNamedPipeBinding nb = new NetNamedPipeBinding();
nb.MaxBufferPoolSize = 5000000;
nb.MaxBufferSize = 500000;
nb.MaxReceivedMessageSize = 500000;
nb.ReceiveTimeout = TimeSpan.FromMinutes(5);

DuplexChannelFactory<IService> myProxy = new DuplexChannelFactory<IService>(myContext, nb, new EndPointAddress("net.pipe://localhost/MyService"));

IService myServiceClient = myProxy.CreateChannel();

And Server side implementation is shown below:

NetNamedPipeBinding np = new NetNamedPipeBinding();
np.MaxBufferPoolSize = 5000000;
np.MaxBufferSize = 500000;
np.MaxReceivedMessageSize = 500000;

host.AddServiceEndpoint(typeof(IService), np, "net.pipe://localhost/MyService");
host.OpenTimeout = TimeSpan.FromMinutes(5);
host.CloseTimeout = TimeSpan.FromMinutes(5);
host.Open();  

I can pass about 100 object collection (ObservableCollection<Customer>) from 1 application through callback to other app. But if I make it 1000 or greater objects, the following Timeout Exception error occurs.

The write to the pipe did not complete within the allotted timeout of 00:00:00. The time allotted to this operation may have been a portion of a longer timeout.

What is the fault in my code ? Please help me to overcome this issue.

Thanks in advance...

Looks like this question was also asked and answered here: http://social.msdn.microsoft.com/Forums/eu/wcf/thread/38926593-8ea6-481d-8c43-072b73292f6a